Since the time of Peter Kropotkin, it's been observed and theorized that cooperation and mutual aid are more common in austere environments. A classic biological example would be slime mold ...
Every so often, we hear of people who go that extra mile and put their life on the line (and sometimes, give their life) for another person - whether it is a loved one or a complete stranger ...
This question has intrigued me for a long time, ever since I experienced it first hand (and continue to do so). Some feel a compulsion to 'step up' and lend a hand to someone in need. An example, ...